Louis James Moriarty, the youngest biological brother of William and adopted sibling of Albert, endured a frail childhood marked by severe illness in an orphanage. His life shifted when Albert, the Moriarty heir, orchestrated their adoption under the guise of securing treatment for him—a ruse that exposed the family’s brutality. This cruelty culminated in a fire that consumed the household, a plot engineered by the brothers. To cement their fabricated demise, Louis scarred his right cheek with a deliberate burn, masking their survival. Assuming stewardship of the Moriarty estates post-tragedy, Louis proved a meticulous administrator. Though reserved and stoic, his loyalty to William anchors his actions. Once a compliant child, he now engages ruthlessly in their campaign to dismantle Britain’s oppressive hierarchy, embracing violence and strategy with equal precision. His insistence on participating in missions reveals a resolve forged through confronting exclusion, transforming passivity into decisive agency. With blond hair, scarlet eyes, and a lean frame accentuated by black-rimmed glasses, Louis’ self-inflicted scar remains a stark emblem of his dedication. Adept in combat, he collaborates closely with William, blending tactical intellect with physical prowess. His long-term strategies include contingencies to eliminate threats like Sherlock Holmes once their goals demand it. Beneath his calculated exterior lies vulnerability, most evident in his unwavering bond with William. Driven by a fervent belief in their vision of justice, Louis navigates the moral shadows of their methods, embodying the tension between cold pragmatism and profound familial devotion. This duality defines him: a strategist who executes ruthless plans yet remains inextricably bound by brotherhood.